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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18f9d126f90c12d8f7df99081dc32f889c856a86979ca8ee43adb2543f6c5f06' 
  AND token = 'ScCcECCg4jC4dcoLAGzzvt6QY9gFhewlACC8OirhnR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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