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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46323c6ffe3cd7d207d18bfde99d6bed39489ccd8f5760b832f645aaec7f4ca6' 
  AND token = 'dBwU0fqNB9QG3rStfmFqA0va+6fY0K7+0idrq6S2InI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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