SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bcdf5a3ca3b811b17a1eb2a30e44202a109c5f478bafd7b1ff5244e116df7ce' 
  AND token = '+Z5JJFhv6ksgrNQttNy3RGNvmtoqpQFsLIoBBwcs9b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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