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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73ede244b4621a76eca3d63a09b4e2d1a3723731f4c1425cabb4f47193056f71' 
  AND token = 'gPO4XViPfAfDDCLcFVAV38NCNn663zMida7QjDKXFQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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