SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67e0d3336e5b3611e6011b4370f3b0055753878859d70496538d27c7978fb4ed' 
  AND token = 'DDVZpNOwOqdSHv5JqYlyL/gqvBreQK24mcJhNDYhZA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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