SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f93aa77462b80bbdd54256f60531aa4bd6a1f8254fc26bb017f2059bd1d71e7b' 
  AND token = 'pV0OCDdlrZ36KuQlH+NQ2gjyJOlI5g/1emdxYSlxxHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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