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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba34c2b3d6353bcc3db22642cbb4d95c7c67477aee3333c0af2bae0fb6fc7954' 
  AND token = 'xmR0RqHuxpK1/TCekATASfd07nFI9p9KLtVgMKcxk7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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