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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91ba6a612c9d70d2fc4ec041a92ad6e0ac12a8de75f4728847d8f3dd8f1947a7' 
  AND token = '+VvwnhC2AfEkug6f4Ze/D1HTM5RPxanWgaXlsyocLCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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