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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc0a9c71f63ee5f3f214ae11e2d36df06c9dbdb7553c7573f27cdb25f76532e1' 
  AND token = 'F0YUQTI9HJkrTUywIHRO11miLMINbNa+Epoel7wXZAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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