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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9a9fccd97acafcaa1b25f61e2d8c6c26258d43ac37180d4c53289b54c769bc0' 
  AND token = 'rPVMQw53HudwFNlYJ4CZkLrDvrYgNT0DrWbzYXc+95E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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