SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d65d20f7f2597a1ae2dfebf7555c40eabb6a821a930b1b22686a8fb482fda5' 
  AND token = 'uhDHSpAQVVm7sB735qyZ2QF5IgYUVrdNNK0ng66mQPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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