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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d858828b21b56bfae4f4224121d0684b9ef84410e56ac7f1eeeb242c384c378' 
  AND token = 'yL6cZGdgOGG2lei8ICEbN6rXMpAG/bMP69oFMHGnRHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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