SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4570eae0db4d59f43236cc7cfb2b387e594aef049d808f46a9d861b475fca0' 
  AND token = 'l7hB/iEHaXRp/sq19g7v5NdJVVR2WtPceN9G8QnisFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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