SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6180f0114566f88e6c346e49ed812536bb7034461e6a9e187f053e95c2f575ca' 
  AND token = '8b8GXGJ8/OZZJzCz2RhjWBO+Qv+WyX0ppXTxfeV/4as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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