SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e66643706777561eba5cc75d1d3ac87b76aed8e4de453422aa3f1eec5b0d1f29' 
  AND token = 'y3X/95yDE5qjXvhh03+uQZBMjsltLyWpYFFnDFwfpfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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