SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ec956a20aa3646ce93a911692bf20349bde9bd9597c1b4561c0a8a59f6c0778' 
  AND token = 'gWKprXb7gvBkNF/IytCc+wax6PZObuAhtoUlxLl82KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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