SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44750c3cc57d92f1916689f68fe6a30946bc8470d3e8513894b70744ecc4172c' 
  AND token = '0PfnImOxiYn5hJOoTwIlvw/7JaP74ja6DYDizZ6f9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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