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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec1948cc2fec6ae86ac7d3f505c0c6d3f642f7815eef292fff0a4724f404222b' 
  AND token = 'AwUtvCaYwvlZIOOjcuNQbf191ZTK/DWtdg2o1WiKxY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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