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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7676cfeeb8c82ff16c5fab51e61a3e3f56ae8346df6bd389e2a18280d762f2' 
  AND token = 'AM4yC5FnFsqpzIVY2vSrT2Rcwde6Zd1gLzZehkT9v3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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