SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2c404a845fb6835ad04c587544698d2a5903fa1b37f6ec13e16d2eea481550e' 
  AND token = 'lbIK+vVJhiILvZq4TRj1/yPTxhkvMwnJHhf2khCpmb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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