SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44ce59ef69a9da9e64b278ff1e804ed4e9eb9526d709dcb25bcd7c23f2661d2b' 
  AND token = 'vKoYjh75X+sx/BD1yCJymcIp+Ng+1XgNmn2mB9SE/fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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