SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a2904735863a83e0b678636436445e1f604aaf15de87b6dd12dbaf72cca20b9' 
  AND token = 'X5nc8w2jGsxC9S0eBY7aXw+Z0rzVx/sJuykC5tKmtyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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