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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1239e0e89d6f42e36825c2d243f9558cc4df89f9cc1bafda729966c15de01db1' 
  AND token = '1DbqFOKuYAMeLYLYTAXVt8q/+aiW113c4/g7tGOaecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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