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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed10f28fad6b7365805cadb2dc9b9f0f6202f12f13c0d1e3ddbb5dfd3d9bf86e' 
  AND token = 'iVUiFzwgxZqXdZ5JQc28O1cV1oiF45WC8MQzNN00F+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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