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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cecb01e67b909b5bc06bd9b8cee96b3cb0eb15cb8023c4d52c486992ed3150fa' 
  AND token = 'cU6KZ4zBUCJ6EoFKYbcZtsA+Y2SlIjwBHb8LXeWkvKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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