SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4039a1fbbe5454032ca8f4db90ff2b324f3bd7a631c03705a98b0774292f04' 
  AND token = 'KXtFznB50x+x0/z+RpU8nj/qwNV8DgQIr3klPoN6Nvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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