SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '663f9ea109a94b237a169f408e94b2ca0ec8e47c470f43dc02b9165df01a9792' 
  AND token = 'mKHpSsDpZGP27aB8LKZ1bIMkK+Pkq9xJgdwUAKH4jD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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