SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '075706cffb67c6280c33dc52431536cf1b230832513018612b8416cb3b97ed3e' 
  AND token = 'mSOE4jAhFsB2XTGe/SUm0kXUUV2V9wQ+E6fqcauo2HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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