SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bdcc6d9ab136fd58f93dc150a9a726eab0929406c15ef5e770b70d34966657f' 
  AND token = 'KG8e8yYmL4DdJD3KqS9HZHpsP5QoGUBit2hw88hQgxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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