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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89d8e1f5be57d36b5b60d0c854d33dca1d04c71f03cc8b7e253e8aed6f471b50' 
  AND token = 'ovSfbxdaOQrIWJq3guyDBMQEaQg01ix3Psia6tmuNVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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