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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2a9af6accd23f1ac5cc28996e2459fd5a67f4753de2164b91e7e1a01e003b59' 
  AND token = 'C4oCFepqQQtx0lWl8/49aAFhO8Nqo51z/r36y4o0Pbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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