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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '935cd42934617a7ee27f30c6c7dddaf409a52f72e81796e7663ec8df2b5404f8' 
  AND token = 'V69WV6xaPnprt9Kj2fQClLo8MMmvNwuduD9xTIW9dKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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