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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84b79ea11e2017ad7dc708307d951a134dd01b4f412398a363220ba45e8323f' 
  AND token = 'sTZ0fzRH+jbnfplDZVZ6Gwa5nofunIfZE0Gpo6lAAyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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