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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a226a05f44a17b51eac8d09684debd69f4ce0717bec8971cddf191f8598cb2f' 
  AND token = 'X2hOqxWzcPEbghRxX+Tg7fsdYX9Y4QwXuIMTR6xP394=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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