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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c992257ce0e69cef5556a9f2454f3147c377f4ccd6ff2aec96f24d5c53a3e10' 
  AND token = 'i9j8HWsxBaWPhxcnrFCs8KJ+kpCLUzuACJjJDsmRevM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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