SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9e6480e1190d594e7c0f7432875e752cf6370b04977b828f7ab81c262514ba7' 
  AND token = 'WTt9H55dr0JEZKwL5VR8pGy/RWRhRFEYJZ5vzDYai8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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