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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39809a72c230e3f1ce93871a1facc97cfc60d14a9d8089c8cf7bd8f84f46e587' 
  AND token = 'Cl2nJ8f3XCYj3vhKcRO8B1hos9o869gorU8lBsXAs3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}