SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b210a03a856ea3c658d9f9569d309beec49cfe42a2efb2a98c1a36ef46785538' 
  AND token = '9Tay5qUh5W0qXhzekx7oKMwSpYVcsV67JyOgnL4Cdqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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