SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb9aeef6457a512e7cff3addc496de9b5e7800a36a15f4397688b9d6c071db64' 
  AND token = 'iheuqJxXEP4wuNnxB7KQ3SKcM8QI+h0RI0RjQgdSu3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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