SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '048866f50b2fabf8c7c8d84967de237b3cc8d39e3e7286998620e47d1a1c4f5e' 
  AND token = '9JRvnVvvMRtEGhJ9i8m/a2z5BRVpGUMzxlOxi5D7nrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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