SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ed7f22b6517262110e678e10abaf5f9938014373befa493591f748b0a685f19' 
  AND token = '6ZA3Vtq4IeWLhzsHRwOY/njCGfCnrbK1f94cxUToeVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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