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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1c9351b676e3ad6798a1032e9059d2ed41125d6c6180177d20887e904fb1549' 
  AND token = 'V4TLanXb9aL5iiFCuS3fiWkmRjZGcaQRgkcIYOCM3Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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