Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b50f0f186ac558e6c471e37c1326678fcd56b69e04f4461320bdcf6b9f0ac602' 
  AND token = 'rmMTYBMetfnaWYu+D4fh/WHtjrgCyl2Pmbuy3FmjuMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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