SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfa79979320c037f0013dd4655ab6b7c30fa429d25a23fb03c977cd82d08c81d' 
  AND token = '2mV8OVYZv24ApbDltNwPsAPYTfzMxDWgnFH7GzBvhPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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