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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a5f6b5366e34de1fa4f386e58ed8dbd5eb291886a16986829f534f553efb907' 
  AND token = '6u9v63F95Qy8rucht+AzEEwglJ2qV9/Axqpr4s1pkC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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