SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58c9dde381fbe0c9f7565e303839039d364118ea60470639ac4b4c5ace152a0' 
  AND token = 'Gvpab+VJKTECzhxzQNEGE08Kgd+DlFpKZCUfzozilvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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