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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9d05b744de99c7bfc91dcfeeef2104d8f4cd7a4e984dcde91bc2113568ce761' 
  AND token = 'nYrb7IJLEQYgdtym8kD7kYknQ6cNzb0EV/aLHK6oCxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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