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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5bc30528d25f766605d79b3ae6c8c26eab3c8bce2a9ff64346b57cf4baf288c' 
  AND token = 'YlLzz34XEzmOIpVwbiCWs/dgdRTxsrFTOlAO7fS+dP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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