SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ca1e8878e41d3890773ec628897fc68a527b5177f04a5433c3264b48685e3e7' 
  AND token = 'ZpDQwZ34JcDqm43gnijw8/4fAF5uWVnKrqxWiH/zwFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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