SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d54d2adc7bbb6b185152f15ea6c6c607cde2b34411ecf7baa3a7069994ae27' 
  AND token = '/RxNqqAtELJxmTwZWcQmXuqU7ZRAKXeKZQ2fXnclBvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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