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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f796f9054bc4b3ab7fe40b6fec107ee360839f96d01894d9d82ed8eb6d9532fd' 
  AND token = 'z7e684PeQ6OAhuhHqjFnrpApivqR97bCwxd8z6dvm18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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