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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cabd59074da879d428904cf2bdfcab165a6205d0bbbc23b4371ef163bdf518a' 
  AND token = '64swo/tFMlkg6Hci/JHJ0cWRxcgWOCIBwz/QfkfJmis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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