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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99b61b1d27c75ff8a72595532015f6910076209415b904ab7b3ac66862bae9b0' 
  AND token = 'dj6275omIAVGd6cZHgh1jexUCy+529K8yFTqU5esl5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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