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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aae4906ac656fe62d4d53c8841e7c67bba4fea797e40d34fbbab71f151f25a88' 
  AND token = 'kUXRIC9rIWHwS5+ejZlGbMz4z2a3o8v4d4XdWqq8cx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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