SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e66f3841c5ae3172e10459fd8690d819d2819e284b4c11509a73f34b8f5c217' 
  AND token = 'FJ7VhFjAHtqUkeBjFa4vGsQQq6jwATobua55k/2lAf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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