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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b95c0099669d16a43fab6bb18caac5cdc888b3d12bb1e863375891d96c366f8' 
  AND token = '6lEgOSB7n6legyrsjEELYfOJx5TR7AqzSAyihC6Iq7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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