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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a1298d0c7909bcb0127b6d769ed9ae61b8e5a67e9b384f47f0be9e6a4989174' 
  AND token = 'rhaLX2GuQngJZGl8Xlo9PNNp1qIoWaWxRCXocwp3X0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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